The stuff I listen to varies considerably, depending on my frame of mind and tasks at hand. I'm one of those people that can't listen to a podcast and do language-basesd work very well. I either find myself not typing or not listening.
Music, meh, like you I can get bored with it.
That being said, there's a lot of "sound" stuff that you can play with. Here's what I've got on my work iPod and when it's applicable:
1.) I've got a slew of Gershwin and 80s tunes that I know like the back of my hand. I can listen to those, and concentrate HEAVILY on my work. I find that because I absently start singing along without realizing it, I'm free to focus on the task at hand without cluttering my mind with explorations of new music. That works well for me.
2.) For mindless busy-work, I listen to new music. Radio, recent CDs I've ripped, etc. My brain is engaged with listening and that keeps me from going insane with the boredom of repetitive crap.
3.) For everything else, there's non-lyrical audio. From classical to new age to big band to new music to jazz, it's stuff that I use to drown out my surroundings when I'm having trouble focusing. I also have a library of nature sounds...wind in the trees, ocean surf, crickets and the like, which are distracting enough to keep me on task without distracting FROM the task at hand.
Listen to a lot of variety. Find what works for you based on your concentration and work style. There's no one-size-fits-all solution, so it's best to experiment to find the one size that fits you.